When a man drinks to excess, smokes or otherwise behaves unhealthily, it probably won't damage his sperm, a new British study contends. But, fertility experts who reviewed the new report, published June 12 in Human Reproduction, weren't in full agreement with the findings. "I am concerned that this limited and isolated study will convey the wrong message to couples desiring to become parents," said Dr. Natan Bar-Chama, director of the Center of Male Reproductive Health at Mt. Sinai Hospital in New York City.